EP3122548A1 - Modèle de prédiction de démoulabilité - Google Patents
Modèle de prédiction de démoulabilitéInfo
- Publication number
- EP3122548A1 EP3122548A1 EP15713971.8A EP15713971A EP3122548A1 EP 3122548 A1 EP3122548 A1 EP 3122548A1 EP 15713971 A EP15713971 A EP 15713971A EP 3122548 A1 EP3122548 A1 EP 3122548A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- force
- mold
- sample
- demolding
- demoulding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0662—Accessories, details or auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/0003—Discharging moulded articles from the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C2037/90—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C2037/90—Measuring, controlling or regulating
- B29C2037/903—Measuring, controlling or regulating by means of a computer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0662—Accessories, details or auxiliary operations
- B29D2030/0665—Measuring, calculating and correcting tyre uniformity before vulcanization
Definitions
- the present invention relates to a method for evaluating the demolding force of a tire of a given mold and more particularly to a method for predicting the demoldability of new sculptures combined with new materials.
- the new ranges of tires must meet a functional specification based on performance such as grip, rolling resistance, noise ... But these new ranges must also have the lowest possible impact on the cost tire manufacturing.
- the cost of manufacture includes both the raw materials used, the cost of making the raw envelopes that will constitute the tire and the cost of the cooking station (time required for vulcanization of the raw envelope and time required for opening of the baking mold), and the longer the time required to open the press in which the mold is placed, is long, the less time is left to cook the raw envelopes. In extreme cases, it is impossible to unmold the envelope after cooking.
- the new tire tread patterns are becoming more complex which increases the demolding time. Being able to anticipate the demoldability of these new sculptures avoids putting on the market solutions that consume too much post-cooking time and are therefore too expensive. Thus, there is a need to have a predictive tool that would avoid making cooking mussels whose factory use would not be, from an industrial point of view, acceptable.
- Patent JP 2012 006 287 discloses a method and a means making it possible, from a portion of sculpture elements, to apprehend the forces necessary for the demoldability of larger sculpture elements while limiting the cost.
- This patent describes a method using a "test piece" representative of a part of the sculpture chosen in the most constraining zone of the complete mold and to measure the forces necessary to overcome the adhesion generated on the test piece and then to transfer it to larger size pieces.
- composition of tire materials is changing rapidly and the nature of the constituents can have a significant effect on demolding efforts. So, with the same sculpture, the simple act of changing tire materials can have a significant impact on demoldability.
- the object of the present invention is to provide a method which allows the material to be taken into account in the evaluation of the demoldability of a tire of the mold.
- the method for evaluating a mold release force of a mold according to the invention consists in measuring the demolding force of a material of a mold sample and a control sample, said method includes:
- the mold sample is a control mold which is known characteristics and the maximum force of withdrawal for a given material which will be the reference material.
- An existing sculpture is compared with the new sculpture with the reference material, and the two solutions are compared: the witness and the new sculpture.
- control molds must be representative of the use of the mold containing the new sculpture: similar baking press, same category of envelope (passenger vehicle, truck, road, winter, ).
- a complementary feature comprises a step of measuring a second mold sample such that the demoulding force M of this second sample is greater than the force M 0 .
- the demoulding force M 0 constitutes a lower limit and the force M constitutes an upper limit.
- Each terminal is constituted by a sample of a high control mold for which the demolding force is important and which materializes the limit not to exceed and a sample of a low control mold whose efforts are acceptable at the factory of a industrial point of view.
- the evaluation of the demolding force of a second material is limited to the following steps:
- the invention also relates to a device for selecting a material / mold pair which comprises a mold sample, a test piece, a force measuring device and a calculation means, and that it uses the method with the previous features.
- the mold sample is selected from an area of the mold where the demolding force is greatest. This makes it possible to measure the effort at the point where it is the most unfavorable industrially.
- the test sample is quite simple to produce, it is substantially rectangular in shape, flat and simply has a recess in which one will measure the demolding force of the material.
- Another subject of the invention relates to a computer program for selecting a material / mold pair which comprises the following instructions:
- Another object of the invention also relates to the use of the method for selecting a material / mold pair such that the force F of demoulding of the material is less than a predetermined demolding force.
- FIG. 1 represents a flowchart of the steps of the method for evaluating the demolding force of a tire
- FIG. 2 represents a selection device according to the invention.
- FIG. 1 represents the flowchart of the steps of the method for evaluating the demolding force of a tire of a mold.
- the method comprises a step E of determination for a reference material 6 mold demoulding forces F 0 of a mold and M 0 of a control sample 3.
- This step E comprises a substep E1 for defining a mold sample 2 from a baking mold of a tire, a sub-step E2 of choice of a reference material 6, a sub-step E3 for measuring the force F 0 of demolding the mold sample 2 by the reference material 6 and a sub-step E4 for determining the demulse force M 0 of the reference material 6 of the test sample 3.
- This step E requires two measurements, one for the mold sample 2 and one for the test sample 3.
- the method comprises a second step P1 for defining the material to be measured 7, followed by a step P2 for determining the release force M of the material 7 of the test sample 3.
- step P3 consists of calculating the material impact coefficient C of the material to be measured 7, this coefficient C is the ratio of the forces M 0 of demoulding the reference material 6 and M of the material 7 of the control sample 3:
- test piece of molds with a high limit and a low limit for each variant to be evaluated of a material.
- the upper limit corresponds to easy demolding and the upper limit corresponds to a difficult release.
- the following table shows examples of easy demolding force values (low indicator) and difficult (high indicator).
- This device 1 comprises a mold sample 2, a test specimen 3, a force measuring device 4 and a calculating means 5.
- the device serves to measure the force F 0 demolding a reference material 6 placed in the mold sample 2 and then the effort M 0 in the control sample 3 through the measuring device 4.
- Said device 1 is then used to measure the effort M of demolding the material to be measured 7 and then calculating with the calculation means 5 the material impact coefficient C and the demolding force F of the material 7 in the mold sample 3.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Tires In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1452449A FR3018718B1 (fr) | 2014-03-24 | 2014-03-24 | Modele de prediction de demoulabilite |
| PCT/FR2015/050470 WO2015145004A1 (fr) | 2014-03-24 | 2015-02-27 | Modele de prediction de demoulabilite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3122548A1 true EP3122548A1 (fr) | 2017-02-01 |
| EP3122548B1 EP3122548B1 (fr) | 2018-07-11 |
Family
ID=50729697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP15713971.8A Active EP3122548B1 (fr) | 2014-03-24 | 2015-02-27 | Modèle de prédiction de démoulabilité |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US10081146B2 (fr) |
| EP (1) | EP3122548B1 (fr) |
| CN (1) | CN106163779B (fr) |
| FR (1) | FR3018718B1 (fr) |
| WO (1) | WO2015145004A1 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3060434A1 (fr) | 2016-12-21 | 2018-06-22 | Compagnie Generale Des Etablissements Michelin | Secteur de moule de cuisson de pneumatique |
| CN111251564A (zh) * | 2020-03-20 | 2020-06-09 | 金发科技股份有限公司 | 用于聚合物注塑成型脱模力测量的系统、方法及应用 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102076461B (zh) * | 2008-06-30 | 2015-11-25 | 米其林研究和技术股份有限公司 | 胎面带脱模工具 |
| JP2012006287A (ja) * | 2010-06-25 | 2012-01-12 | Bridgestone Corp | 加硫金型の離型力検出方法および装置 |
| JP5479303B2 (ja) * | 2010-11-02 | 2014-04-23 | 株式会社ブリヂストン | タイヤ加硫用金型の摺動モデル装置 |
-
2014
- 2014-03-24 FR FR1452449A patent/FR3018718B1/fr not_active Expired - Fee Related
-
2015
- 2015-02-27 CN CN201580015785.2A patent/CN106163779B/zh active Active
- 2015-02-27 WO PCT/FR2015/050470 patent/WO2015145004A1/fr not_active Ceased
- 2015-02-27 EP EP15713971.8A patent/EP3122548B1/fr active Active
- 2015-02-27 US US15/128,587 patent/US10081146B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106163779A (zh) | 2016-11-23 |
| US20170106612A1 (en) | 2017-04-20 |
| WO2015145004A1 (fr) | 2015-10-01 |
| FR3018718A1 (fr) | 2015-09-25 |
| EP3122548B1 (fr) | 2018-07-11 |
| US10081146B2 (en) | 2018-09-25 |
| FR3018718B1 (fr) | 2017-03-24 |
| CN106163779B (zh) | 2018-07-24 |
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